Alzheimer’s disease: It refers to the persistent impairment in the nature of the acquired intelligence that occurs in old age, with intelligence deficits and reduced social adaptability. It is a chronic progressive disease with insidious onset and gradual onset, mainly characterized by loss of abstract thinking ability, inadequate reasoning and planning, and attention deficit; loss of interest and motivation, emotional retardation or difficulty in suppressing emotions, social misbehavior, and unconventionality in personality; forgetfulness, inability to learn, and poor temporal, topographical, visual, and spatial orientation in memory; and poor speech and cognitive function. In memory, there is forgetfulness, inability to learn, and poor orientation in time, topography, vision, and space; in speech and cognitive function, there is a lack of fluency in speech and a lack of general ability. Alzheimer’s disease, also known as Alzheimer’s disease, is a disease that manifests as a loss of intellectual ability in a normal state of consciousness. Alzheimer’s disease is a disease of the brain that causes a gradual loss of nerve cells in the brain. As the nerve cells in the brain are responsible for thinking, remembering and acting, the patient’s mental function gradually decreases, which may eventually affect daily life activities. According to statistics, the number of people with Alzheimer’s disease is currently 12 million worldwide. In the United States, the disease has become the fourth leading killer after cardiovascular disease, cancer and stroke. As time progresses, Alzheimer’s patients eventually lose even the most basic activities of daily living, such as brushing their teeth, dressing and bathing. Symptoms of cerebral atrophy Cerebral atrophy starts slowly and gets worse slowly, and the date of onset is difficult to determine for most patients. The following symptoms may occur: 1. Decreased intelligence: memory loss. For example, falling things, forgetting what has been promised; understanding, judgment, calculation ability decreases, forgetting what their names are, how old they are, not knowing that it is time to eat when hungry, not knowing to go out to go home, not recognizing relatives and friends, etc. 2. Loss of function of the five senses: poor eyesight, deafness, poor speech, tinnitus and deafness, hallucinations and hallucinations. 3, personality behavior change: do not like to interact with people, lack of affection for relatives; bad temper, suspicious, selfish, do not care about the big things, the chicken and the chicken are never ending with you; should not sleep, senior emotional activities (sense of shame, sense of honor, sense of responsibility, sense of morality, etc.) have different degrees of decline. 4, physical symptoms: early dizziness, headache, insomnia and dreaminess, weakness of the waist and knees, numbness of the hands and feet; slowly slow reaction, unstable walking; severe hemiplegia, tremor, etc.. In severe cases, hemiplegia and tremors may occur. The person is unable to take care of himself or herself and can only lie in bed, just like a vegetable. The prevention of Alzheimer’s disease should start from middle age, because if Alzheimer’s disease is detected in the pre-dementia period or early dementia period, and if corresponding measures are taken in life, it is possible to control its development, and it can be transformed to a certain extent to a good direction. From the results of recent studies, the main measures to prevent the occurrence of dementia are as follows: 1, to avoid the occurrence of cerebral arteriosclerosis and cerebral thrombosis and other diseases, in order to prevent dementia caused by insufficient blood supply to the brain, arteriosclerosis is the main “enemy” of dementia, adjust the diet, eat less salt, and carry out suitable physical activities It can help to prevent arteriosclerosis. 2, pay attention to intellectual training, diligent brain, in order to slow down the aging brain. Research shows that often do brain, and interesting things, can keep people’s minds sharp, forging brain cells responsive, and do nothing all day, the proportion of Alzheimer’s disease is higher. Older people should maintain vitality and use their brains more, such as reading more books and learning more new things; cultivating hobbies can activate brain cells and prevent brain aging; attention should be paid to extensive contact with people in all aspects, such as chatting with friends, playing mahjong, chess, etc., which can stimulate nerve cell vitality. 3, strengthen the spiritual conditioning: people often say: “smile, ten years less”, pay attention to maintain optimism, that is, to be quiet and fearless, calm and vain, and the world without contention, contented and happy, clear-hearted. Do not be tempted by materialistic desires outside, do not exist within the emotional excitement, so as to help the health does not decline. 4, pay attention to maintaining interpersonal relationships, avoid long-term depression, because depression is a risk factor for dementia in the elderly, so to avoid mental stimulation, in order to prevent damage to brain tissue function; In addition, maintain family harmony can keep a happy mood, can enhance the ability to resist disease. 5, strengthen physical exercise: many people know that exercise can reduce the chance of stroke, in fact, exercise can also promote the production of nerve growth hormone, which can prevent brain degeneration. In addition to the overall body activities, should try to move the fingers more. 6, the regularity of living and eating: generally should go to bed early and get up early, eat regularly, defecate regularly, to keep the smooth stool for the prevention of dementia has a positive significance. In terms of diet, emphasize the “three fixed, three high, three low and two precautions”, “three fixed” that is, regular, quantitative, fixed quality; “three high” that is, high protein, high unsaturated fatty acids, high vitamin The “three highs” are high protein, high unsaturated fatty acids and high vitamins; the “three lows” are low fat, low calories and low salt; and the “two quits” are smoking and alcohol cessation. The elderly should be supplemented with more beneficial minerals and trace elements, the lack of essential trace elements (such as zinc, etc.) can lead to insufficient blood supply to the brain, causing vascular disease. Proper supplementation of vitamin E can enhance memory and also help prevent Alzheimer’s disease. In addition, the elderly should eat more fish. A study conducted by Dutch scientists on 5,000 older people over 55 years old showed that older people who ate fish regularly were only 0.4 times more likely to suffer from Alzheimer’s disease than those who did not eat fish.